CN107487865A - A kind of bioelectrochemistry effectively processing phenolic waste water containing chromium and the method produced electricity - Google Patents
A kind of bioelectrochemistry effectively processing phenolic waste water containing chromium and the method produced electricity Download PDFInfo
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- 239000011651 chromium Substances 0.000 title claims abstract description 81
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000002351 wastewater Substances 0.000 title claims abstract description 59
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000005611 electricity Effects 0.000 title claims abstract description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 34
- 239000011780 sodium chloride Substances 0.000 claims abstract description 17
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000010612 desalination reaction Methods 0.000 claims abstract description 12
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- WQPDQJCBHQPNCZ-UHFFFAOYSA-N cyclohexa-2,4-dien-1-one Chemical compound O=C1CC=CC=C1 WQPDQJCBHQPNCZ-UHFFFAOYSA-N 0.000 claims 1
- 230000000737 periodic effect Effects 0.000 claims 1
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- 229910001385 heavy metal Inorganic materials 0.000 description 7
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- 238000010586 diagram Methods 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
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- 230000008859 change Effects 0.000 description 2
- WHWMQDLQJFHHGJ-UHFFFAOYSA-N chromium phenol Chemical compound C1(=CC=CC=C1)O.[Cr] WHWMQDLQJFHHGJ-UHFFFAOYSA-N 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
本发明涉及一种生物电化学技术有效去除含铬苯酚废水并产电的方法，属于生物电化学领域，该系统的特征在于首次将集中于海水淡化领域的微生物脱盐池运用于含铬苯酚废水并产电，通过培养一定微生物量的生物膜，选择合适的阴极液，投加一定浓度重铬酸钾、苯酚与氯化钠混合液模拟的含铬苯酚废水，确定合理的水力停留时间，以有效去除含铬苯酚废水。
The invention relates to a method for effectively removing chromium-containing phenol wastewater and generating electricity through bioelectrochemical technology, which belongs to the field of bioelectrochemistry. The system is characterized in that the microbial desalination pool concentrated in the field of seawater desalination is applied to chromium-containing phenol wastewater for the first time and produced. To produce electricity, by cultivating a certain amount of microbial biofilm, selecting a suitable catholyte, adding a certain concentration of potassium dichromate, phenol and sodium chloride mixture to simulate chromium-containing phenol wastewater, and determining a reasonable hydraulic retention time to effectively Removal of chromium-containing phenol wastewater.
Description
技术领域technical field
本发明属于生物电化学系统领域，该系统的特征在于首次将集中于海水淡化领域的微生物脱盐池运用于含铬苯酚废水并产电，通过培养一定微生物量的生物膜，选择合适的阴极液，投加一定浓度重铬酸钾、苯酚与氯化钠混合液模拟的含铬苯酚废水，确定合理的水力停留时间，以有效去除含铬苯酚废水。The present invention belongs to the field of bioelectrochemical systems, and the system is characterized in that the microbial desalination pool concentrated in the field of seawater desalination is applied to chromium-containing phenol wastewater for the first time to generate electricity, and a suitable catholyte is selected by cultivating a biofilm with a certain amount of microorganisms. Add a certain concentration of potassium dichromate, phenol and sodium chloride mixture to simulate chromium-containing phenol wastewater, and determine a reasonable hydraulic retention time to effectively remove chromium-containing phenol wastewater.
背景技术Background technique
重金属有机废水是指同时富含重金属离子及有机污染物的一类废水。这类废水主要来源于制药、工业鞣革、颜料生产、家电造、汽车电泳磷化、电镀的洗涤过程等，若未经处理进入环境会产生极大的危害。人体利用的铬通常是三价的，大量摄入六价铬会带来致癌、致突变等不良影响，美国疾控中心毒害物质及疾病登记署将六价铬列为前20位优先监测的物质之一。苯酚类的废水污染范围广，危害性大，如果不经处理任意排放，对人体、鱼类以及农作物有严重危害。人长期引用被苯酚污染的水会引起头痛、疲劳、失眠、耳鸣、贫血及神经系统病症。废水中的重金属无法降解，只能发生形态改变或转移，通过水生生物或农作物富集，并通过食物链危害人体健康，或直接污染居民饮用水，造成慢性中毒、引发癌症、增加死亡率等严重后果；大量难降解、有毒的有机物进入水体会消耗溶解氧使水质恶化，不利于水生生物生存，且会造成严重持久的环境影响和生态危害。目前我国对重金属有机废水的处理技术有限，传统的处理方法工序复杂、运行成本高，因此寻找一种高效、低能耗处理重金属有机废水的方法意义重大。Heavy metal organic wastewater refers to a type of wastewater rich in heavy metal ions and organic pollutants. This kind of wastewater mainly comes from pharmaceuticals, industrial tanning, pigment production, home appliance manufacturing, automobile electrophoresis phosphating, electroplating washing process, etc. If it enters the environment without treatment, it will cause great harm. The chromium used by the human body is usually trivalent, and a large amount of hexavalent chromium will cause carcinogenic, mutagenic and other adverse effects. The US Centers for Disease Control and Prevention has listed hexavalent chromium as the top 20 priority monitoring substances one. Phenol wastewater has a wide range of pollution and is very harmful. If it is discharged without treatment, it will cause serious harm to human body, fish and crops. Long-term drinking of phenol-contaminated water can cause headaches, fatigue, insomnia, tinnitus, anemia and nervous system disorders. Heavy metals in wastewater cannot be degraded, but can only undergo morphological changes or transfers. They are enriched by aquatic organisms or crops, and endanger human health through the food chain, or directly pollute residents’ drinking water, causing serious consequences such as chronic poisoning, cancer, and increased mortality. ; A large number of refractory and toxic organic substances entering the water will consume dissolved oxygen and deteriorate the water quality, which is not conducive to the survival of aquatic organisms, and will cause serious and lasting environmental impacts and ecological hazards. At present, my country's treatment technology for heavy metal organic wastewater is limited, and traditional treatment methods are complicated in process and high in operating costs. Therefore, it is of great significance to find a method for treating heavy metal organic wastewater with high efficiency and low energy consumption.
生物电化学系统是一种生物催化剂即微生物在电极上进行氧化或还原反应的电化学系统。这种生物电化学系统中的产电微生物氧化有机物释放电子传递至阳极，且阳极微生物将来自中间室的苯酚矿化为CO2，阴极液中Cr6+接受来自阳极的电子被还原为毒性较低的Cr3+。A bioelectrochemical system is an electrochemical system in which biocatalysts, that is, microorganisms perform oxidation or reduction reactions on electrodes. Electrogenic microorganisms in this bioelectrochemical system oxidize organic matter and release electrons to the anode, and the anode microorganisms mineralize phenol from the intermediate chamber into CO 2 , and Cr 6+ in the catholyte accepts electrons from the anode and is reduced to less toxic Low Cr 3+ .
含铬苯酚废水的处理方法有：(1)传统处理法：化学沉淀法、气浮法、物理吸附法；(2)生物膜法与电解法；(3)电-生物膜复合工艺；厌氧生物能够有效降解废水中难降解的有机物，具有成本低及应用范围广等特点，而电解法能够去除大部分重金属离子，将生物法与电解法两者结合处理含铬苯酚废水可以避免重金属被生物膜吸附。本发明采用三室结构，通过在阳极培养一定微生物量的生物膜，选择合适的阴极液，投加一定浓度重铬酸钾、苯酚与氯化钠混合液模拟的含铬苯酚废水在中间室，确定合理的水力停留时间，以有效去除含铬苯酚废水。The treatment methods of chromium-containing phenol wastewater include: (1) traditional treatment methods: chemical precipitation method, air flotation method, physical adsorption method; (2) biofilm method and electrolysis method; (3) electro-biofilm composite process; anaerobic Biology can effectively degrade refractory organic matter in wastewater, and has the characteristics of low cost and wide application range, while electrolysis can remove most heavy metal ions. Combining biological method and electrolysis to treat chromium-containing phenol wastewater can avoid heavy metals from being biodegraded. membrane adsorption. The present invention adopts a three-chamber structure. By cultivating a biofilm with a certain amount of microorganisms on the anode, selecting a suitable catholyte, and adding a certain concentration of potassium dichromate, phenol and sodium chloride mixed solution to simulate chromium-containing phenol wastewater in the middle chamber, determine Reasonable hydraulic retention time to effectively remove chromium-containing phenol wastewater.
发明内容Contents of the invention
本发明是以含铬苯酚废水为研究对象，首次将集中于海水淡化领域的微生物脱盐池运用于含铬苯酚废水的处理，通过选择合适的阴极液，投加一定浓度重铬酸钾、苯酚与氯化钠混合液模拟的含铬苯酚废水，确定合理的水力停留时间，以有效去除含铬苯酚废水。The present invention takes chromium-containing phenol wastewater as the research object. For the first time, the microbial desalination pool concentrated in the field of seawater desalination is applied to the treatment of chromium-containing phenol wastewater. By selecting a suitable catholyte, a certain concentration of potassium dichromate, phenol and The chromium-containing phenol wastewater simulated by the sodium chloride mixture is determined to determine a reasonable hydraulic retention time to effectively remove the chromium-containing phenol wastewater.
生物电化学系统去除含铬苯酚废水的装置是以由阳极室、中间室和阴极室分别为4*4*3cm3、4*4*1cm3、4*4*3cm3有机玻璃长方体三者串联而成，阳极室以生活污水为接种液并投加1g/L的无水乙酸钠用于培养一定微生物量的生物膜，中间室投加一定浓度重铬酸钾、苯酚与氯化钠混合液模拟的含铬苯酚废水，阴极室使用pH＝7的50mM磷酸盐缓冲溶液作为阴极液，将该反应器置于恒温箱内培养。中间室模拟的含铬苯酚废水在电场及浓度梯度的共同作用下，苯酚向阳极迁移被阳极微生物矿化为CO2，同时Cr6+向阴极迁移并最终得电子还原为Cr3+。本装置为三室反应器，阳极室和中间室以阴离子交换膜间隔，阴极室和中间室以阳离子交换膜间隔，反应器外电阻为1000Ω。反应器的阳极电极材料为碳刷，阴极电极材料为载铂碳布，因此在阳极至阴极反应器内部构成一个由离子传递而外部由电子传递形成的回路。The bioelectrochemical system for removing chromium-containing phenol wastewater is composed of anode chamber, intermediate chamber and cathode chamber, respectively 4*4*3cm 3 , 4*4*1cm 3 , 4*4*3cm 3 plexiglass cuboids connected in series The anode room uses domestic sewage as the inoculum and adds 1g/L anhydrous sodium acetate to cultivate a certain amount of microbial biofilm, and the middle room adds a certain concentration of potassium dichromate, a mixture of phenol and sodium chloride For the simulated chromium-containing phenol wastewater, the cathode compartment uses 50 mM phosphate buffer solution with pH=7 as catholyte, and the reactor is placed in a constant temperature box for cultivation. The chromium-containing phenol wastewater simulated in the middle chamber is under the combined action of electric field and concentration gradient. Phenol migrates to the anode and is mineralized into CO 2 by the anode microorganisms. At the same time, Cr 6+ migrates to the cathode and finally obtains electrons and is reduced to Cr 3+ . The device is a three-chamber reactor, the anode chamber and the middle chamber are separated by an anion exchange membrane, the cathode chamber and the middle chamber are separated by a cation exchange membrane, and the external resistance of the reactor is 1000Ω. The anode electrode material of the reactor is carbon brush, and the cathode electrode material is platinum-loaded carbon cloth. Therefore, a loop formed by ion transfer inside the anode-to-cathode reactor and electron transfer outside is formed.
阳极和阴极分别位于阳极室和阴极室，反应体系的阳极由附着有产电微生物的碳刷组成，阴极由载铂碳布构成并无微生物附着，阴阳极间距在1-5cm之间。The anode and cathode are respectively located in the anode chamber and the cathode chamber. The anode of the reaction system is composed of carbon brushes with electrogenic microorganisms attached, and the cathode is composed of platinum-loaded carbon cloth without microorganisms attached. The distance between the cathode and the anode is between 1-5cm.
在200mg/L K2Cr2O7、100mg/L C6H6O、4g/L NaCl混合液模拟的含铬苯酚废水条件下，选择合适的阴极液，使得含铬苯酚废水中的Cr6+被有效去除，同时又不影响该系统的产电性能，周期运行结束时Cr6+去除率高达99.9％，苯酚的去除率高达100％。Under the condition of chromium-containing phenol wastewater simulated by 200mg/L K 2 Cr 2 O 7 , 100mg/LC 6 H 6 O, 4g/L NaCl mixture, the appropriate catholyte was selected so that Cr 6+ in chromium-containing phenol wastewater was Effective removal without affecting the power generation performance of the system, the removal rate of Cr 6+ is as high as 99.9% and the removal rate of phenol is as high as 100% at the end of cycle operation.
在200mg/L K2Cr2O7、100mg/L C6H6O、4g/L NaCl混合液模拟的含铬苯酚废水条件下，选择合适的阴极液，电流密度在4h时达峰值为0.64A/m2。Under the conditions of chromium-containing phenol wastewater simulated by 200mg/L K 2 Cr 2 O 7 , 100mg/LC 6 H 6 O, and 4g/L NaCl mixture, the current density reaches a peak value of 0.64A/ m 2 .
使用pH＝7的50mM磷酸盐缓冲溶液作为阴极液时，水力停留时间为72h，该系统最大电流密度达0.64A/m2。在周期前24h时Cr6+去除率高达98.4％，苯酚的去除率高达99.9％。When 50mM phosphate buffer solution with pH=7 is used as catholyte, the hydraulic retention time is 72h, and the maximum current density of the system reaches 0.64A/m 2 . In the first 24 hours of the cycle, the removal rate of Cr 6+ was as high as 98.4%, and the removal rate of phenol was as high as 99.9%.
本发明所提供的一种生物电化学去除含铬苯酚废水并产电方法的优点在于：首次将集中于海水淡化领域的微生物脱盐池运用于含铬苯酚废水的处理，通过培养一定微生物量的生物膜，选择合适的阴极液，投加一定浓度重铬酸钾、苯酚与氯化钠混合液模拟的含铬苯酚废水，确定合理的水力停留时间，使得含铬苯酚废水中的Cr6+被有效去除，同时又不影响该系统的产电性能，周期运行结束时Cr6+去除率高达99.9％，苯酚的去除率高达99.9％。The advantage of the bioelectrochemical method for removing chromium-containing phenol wastewater and generating electricity provided by the present invention is that for the first time, the microbial desalination pool concentrated in the field of seawater desalination is applied to the treatment of chromium-containing phenol wastewater. Membrane, choose the appropriate catholyte, add a certain concentration of potassium dichromate, phenol and sodium chloride mixture to simulate the chromium-containing phenol wastewater, determine a reasonable hydraulic retention time, so that the Cr 6+ in the chromium-containing phenol wastewater can be effectively removal without affecting the power generation performance of the system, the removal rate of Cr 6+ is as high as 99.9% and the removal rate of phenol is as high as 99.9% at the end of cycle operation.
附图说明Description of drawings
附图1是生物电化学系统三室反应器去除含铬苯酚废水系统示意图。Accompanying drawing 1 is the schematic diagram of the three-chamber reactor of the bioelectrochemical system for removing chromium-containing phenol wastewater.
附图2是生物电化学系统以pH＝7的50mM磷酸盐缓冲溶液作为阴极液的条件下，200mg/L K2Cr2O7、100mg/L C6H6O、4g/L NaCl混合液模拟的含铬苯酚废水中Cr6+浓度变化示意图。Accompanying drawing 2 is bioelectrochemical system under the condition that 50mM phosphate buffer solution of pH=7 is used as catholyte, 200mg/L K 2 Cr 2 O 7 , 100mg/LC 6 H 6 O, 4g/L NaCl mixed solution simulation Schematic diagram of the change of Cr 6+ concentration in chromium-containing phenol wastewater.
附图3是生物电化学系统以pH＝7的50mM磷酸盐缓冲溶液作为阴极液的条件下，200mg/L K2Cr2O7、100mg/L C6H6O、4g/L NaCl混合液模拟的含铬苯酚废水中苯酚浓度变化示意图。Accompanying drawing 3 is bioelectrochemical system under the condition that 50mM phosphate buffer solution of pH=7 is used as catholyte, 200mg/L K 2 Cr 2 O 7 , 100mg/LC 6 H 6 O, 4g/L NaCl mixed solution simulation Schematic diagram of the change of phenol concentration in chromium-containing phenol wastewater.
附图4是生物电化学系统以pH＝7的50mM磷酸盐缓冲溶液作为阴极液的条件下，200mg/L K2Cr2O7、100mg/L C6H6O、4g/L NaCl混合液模拟的含铬苯酚废水电流密度曲线示意图。Accompanying drawing 4 is bioelectrochemical system under the condition that 50mM phosphate buffer solution of pH=7 is used as catholyte, 200mg/L K 2 Cr 2 O 7 , 100mg/LC 6 H 6 O, 4g/L NaCl mixed solution simulation Schematic diagram of the current density curve of chromium-containing phenol wastewater.
具体实施方式detailed description
生物电化学系统去除含铬苯酚废水装置使用pH＝7的50mM磷酸盐缓冲溶液作为阴极液，中间室的模拟含铬苯酚废水，在电场及浓度梯度的共同作用下，苯酚向阳极迁移被阳极被微生物矿化为CO2，同时Cr6+向阴极迁移，并最终得电子还原为Cr3+。反应器外部串联一个外1000Ω的电阻，阳极室微生物氧化有机物释放的电子通过外电路转移至阴极，阴极室Cr6+最终得电子还原为Cr3+，其水力停留时间为72h。其中阳极室进液基质为：1g/L的无水乙酸钠溶液、无机盐溶液(Na2HPO44.0896g/L；NaH2PO42.544g/L；NH4Cl 0.31g/L；KCl 0.13g/L)、12.5mL/L微量元素、12.5mL/L维生素溶液；中间室进水为200mg/L K2Cr2O7、100mg/LC6H6O、4g/L NaCl混合液模拟的含铬苯酚废水；阴极液为pH＝7的50mM磷酸盐缓冲溶液。The bioelectrochemical system removes chromium-containing phenol wastewater. The device uses a 50mM phosphate buffer solution with pH=7 as the catholyte. The simulated chromium-containing phenol wastewater in the middle chamber, under the joint action of the electric field and the concentration gradient, phenol migrates to the anode and is absorbed by the anode. Microorganisms mineralize into CO 2 , and at the same time Cr 6+ migrates to the cathode, and finally obtains electrons and reduces them to Cr 3+ . An external 1000Ω resistor is connected in series outside the reactor, and the electrons released by microorganisms in the anode chamber to oxidize organic matter are transferred to the cathode through the external circuit, and the Cr 6+ electrons in the cathode chamber are finally reduced to Cr 3+ , with a hydraulic retention time of 72h. Among them, the anode chamber feed matrix is: 1g/L anhydrous sodium acetate solution, inorganic salt solution (Na 2 HPO 4 4.0896g/L; NaH 2 PO 4 2.544g/L; NH 4 Cl 0.31g/L; KCl 0.13 g/L), 12.5mL/L trace elements, 12.5mL/L vitamin solution; the water in the middle chamber is 200mg/LK 2 Cr 2 O 7 , 100mg/LC 6 H 6 O, 4g/L NaCl Chromium phenol wastewater; catholyte is 50mM phosphate buffer solution with pH=7.
利用本发明所提供的一种生物电化学去除含铬苯酚废水并产电的方法，首次将集中于海水淡化领域的微生物脱盐池运用于含铬苯酚废水的处理，选择合适的阴极液，使得含铬苯酚废水中的Cr6+被有效去除，同时又不影响该系统的产电性能。周期运行结束时Cr6+去除率高达99.9％，苯酚的去除率高达100％，是一种更加优化的含铜有机废水的方法。Utilizing a bioelectrochemical method for removing chromium-containing phenol wastewater and generating electricity provided by the present invention, the microbial desalination pool concentrated in the field of seawater desalination is first applied to the treatment of chromium-containing phenol wastewater, and a suitable catholyte is selected to make the chromium-containing phenol wastewater Cr 6+ in chrome phenol wastewater was effectively removed without affecting the power generation performance of the system. At the end of the cycle operation, the removal rate of Cr 6+ is as high as 99.9%, and the removal rate of phenol is as high as 100%, which is a more optimized method for copper-containing organic wastewater.
生物电化学系统去除含铬苯酚废水的浓度为200mg/L K2Cr2O7、100mg/L C6H6O、4g/L NaCl混合液，以pH＝7的50mM磷酸盐缓冲溶液作为阴极液，Cr6+去除率高达99.9％，产生最大电流密度为0.64mA/m2。The concentration of the bioelectrochemical system to remove chromium-containing phenol wastewater is 200mg/LK 2 Cr 2 O 7 , 100mg/LC 6 H 6 O, 4g/L NaCl mixed solution, and the 50mM phosphate buffer solution with pH=7 is used as the catholyte. The removal rate of Cr 6+ is as high as 99.9%, and the maximum current density is 0.64mA/m 2 .
生物电化学系统以pH＝7的50mM磷酸盐缓冲溶液作为阴极液的条件下，中间室为200mg/L K2Cr2O7、100mg/L C6H6O、4g/L NaCl混合液模拟的含铬苯酚废水，周期结束时苯酚的去除率高达100％。Under the condition that the bioelectrochemical system uses a 50mM phosphate buffer solution of pH= 7 as the catholyte , the intermediate chamber is a simulated mixed solution containing Chromium phenol wastewater, the removal rate of phenol is as high as 100% at the end of the cycle.
生物电化学系统将含铬苯酚废水中Cr6+的还原为Cr3+，在Cr6+还原过程中，Cr6+的浓度逐渐减小，与此同时废水中的苯酚在阳极室被微生物矿化成CO2，随着反应的进行，含铬苯酚废水中Cr6+和苯酚的去除率稳定在某一值附近。The bioelectrochemical system reduces the Cr 6+ in the chromium-containing phenol wastewater to Cr 3+ . During the reduction process of Cr 6+ , the concentration of Cr 6+ gradually decreases. Converted into CO 2 , with the progress of the reaction, the removal rate of Cr 6+ and phenol in the chromium-containing phenol wastewater is stable around a certain value.
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